As you noticed, as the point of no-return is reached but before the ejaculation itself begins, pressing firmly on the perineum immediately behind the scrotal sac will pinch the base of the penile urethra, manually squeezing the sphincter and preventing its opening. This, in turns blocks the expulsion of semen. Pressure should be maintained for as long as you experience orgasmic contractions, at least, if not a little longer to allow the pressure inside the posterior urethra to subside.
I understand you know all this since this is what you are doing already, but this intro was to put others to speed if they needed to be. So, now on to your questions :
a) Is there any damage to my cock or health problem doing this ?
Semen in itself is non toxic : what hasn’t been expelled during ejaculation will be recycled and reused or washed out with urine. Metabolically, there are no health problem to be developed from not ejaculating. In other words, you won’t get diabetes, hypertension, cholesterol or liver problems because of this.
This perineal push technique is not anatomically healthy however : it should be considered as a last resort method when you feel you’ve lost control while edging. It should not be your main method to prevent ejaculation : instead, you should learn to better identify your point of no-return and stop masturbating (or at least slow down) to allow your arousal to wane a little.
Aside from the fact that you may experience some pain in the testicles and around the anus, damage may be caused with frequent use of this technique over time to the ejaculation-related parts of body including the ejaculatory ducts and vas deferens as a result of over pressurization. Using this method repeatedly will also lead to retrograde ejaculations as the urethral sphincter muscle will weaken over time as a result of being exposed to higher pressure than what it was designed for. As for your penis, since it is after the sphincter, it cannot be affected by this. Let me insist on the fact that using this method once in a while will never be a problem. The problem is using it too often.
Retrograde ejaculation may not appear to be a huge problem initially : why should you bother if your semen goes into your bladder ? As I said earlier, semen is non toxic, so your bladder won’t suffer from this. What’s annoying with retrograde ejaculation is that when time comes for you to ejaculate for real, your cumshot will be much smaller as a proportion of your payload will be simultaneously ejaculated into your bladder. This may lead to fertility problem… as well as impact on the quality of the show !
Note however, that all this is true only when you press the base of your penis behind your balls to stop the shooting. I you instead choose to simply stop to masturbate altogether and not ejaculate at all, then there will be no over pressurization (as this happens because you willfully prevent the opening of the sphincter). If you simply stop masturbating, then whatever semen was prepared will simply sit there, in the posterior urethra. And as I said earlier, semen is non toxic and non dangerous in itself, so nothing bad is to be expected… except maybe that you may feel cranky and frustrated !
b) Where does the cum go if I don’t shoot ?
You probably got it by now : semen is non toxic ! What hasn’t been expelled by ejaculation will be recycled and reused or washed out with urine.
You will notice, the first time you pee after you’ve ejaculated (or not), that your urine is foamier. If you haven’t ejaculated at all, it may also be a bit cloudy also : that’s the unused semen being washed out. The foaminess of urine is caused by the high protein content… in this case from the semen.
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